The ModelMinders with the KM have a motion sensor as well as a wireless door sensor. A motion sensor is necessary in a multi level unit (i.e. living area downstairs and bedrooms upstairs).
MM-6K : 6 Breakers
MM-6KM : 6 Breakers + Motion Sensor
MM-10K : 10 Breakers
MM-10KM : 10 Breakers + Motion Sensor